Sampling probe for gas analysis

Abstract

The invention discloses a sampling probe for gas analysis, and relates to the technical field of gas sensors, the sampling probe comprises a gas analyzer and a shell, the gas analyzer is connected with the shell, the shell is in bearing connection with a sampling mechanism, the sampling mechanism comprises a sampling tube, a filter screen, a second gear, a movable frame, a second piston, a second spring, a circular plate and a convex block, the sampling tube is connected with the shell through a bearing, and the right end of the sampling tube is of a trumpet-shaped structure. According to the sampling probe for gas analysis, the intermittent rotating mechanism is adopted, the adjusting effect of the sampling pipe in different directions can be achieved, the gas sampling effect in different directions can be achieved, the comprehensive detection effect can be achieved, and then the situation that gas flow influences the accuracy and comprehensiveness of detection data can be avoided; and when the sampling pipe rotates, gas in the sampling pipe can be discharged, so that the influence on the accuracy of detection data due to cross contamination of gas in different directions is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of gas sensors, and particularly to a sampling probe for gas analysis. Background Art

[0002] In many fields such as industrial production, environmental monitoring, and safety protection, gas sensors have become the core equipment for monitoring gas composition and concentration due to their characteristics of rapid detection and real-time feedback. From the real-time monitoring of reaction gases in the chemical production process to the continuous monitoring of pollutant concentrations in the atmospheric environment, the accurate measurement of gas sensors is directly related to production safety, environmental quality, and personnel health. However, the performance of gas sensors not only depends on the sensitivity and selectivity of the sensors themselves, but more on the design and function implementation of the front-end sampling probe.

[0003] In environmental protection work, gas pollution is one of the common pollutions. Through the gas sensors in gas analyzers, harmful substances such as PM2.5, carbon dioxide, carbon monoxide, sulfur dioxide, and nitrogen dioxide in the air can be detected, which helps the staff understand the environmental pollution situation for subsequent targeted treatment. When taking gas detection samples, a sampling probe is needed to take samples, and cooperate with a gas analyzer to analyze and process the sampled air. Finally, the relevant detected data is displayed on the display screen for the staff to view;

[0004] An existing sampling probe for gas analysis, such as the one disclosed in CN221123973U, includes an end seat. One end of the end seat is used to communicate with a sampling pipe. It also includes a filter cylinder. The other end of the end seat is detachably connected to a fixed cylinder. The fixed cylinder has an open end facing away from the end seat. A filter cylinder communicating with the end seat is accommodated in the fixed cylinder. In this utility model, the filter cylinder is connected by the end seat, and then the filter cylinder filters the gas environment to be measured, preventing impurities in the gas environment to be measured from entering the sampling pipeline. The fixed cylinder protects the filter cylinder, improves the stability of the filter cylinder, and prevents the filter cylinder from deforming or being damaged by external forces. At the same time, the open end of the fixed cylinder is connected to the gas outlet to be measured at the fixed position, facilitating real-time sampling of the gas to be measured and making it more convenient to use;

[0005] In the actual use process of the above existing sampling probe, it is impossible to separately collect multi-directional gases. From practical life experience, due to the influence of factors such as air flow, there are certain differences in the content of harmful gases in gases in different directions. Therefore, when using the existing sampling probe for detection, it is difficult to ensure the comprehensiveness, accuracy, and reliability of the detection data. For this reason, in view of the above problems, a sampling probe for gas analysis is designed to better meet the actual use requirements. Summary of the Invention

[0006] The purpose of the present invention is to provide a sampling probe for gas analysis to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A sampling probe for gas analysis, comprising a gas analyzer and a housing. The gas analyzer is connected to the housing. A gas sensor is installed inside the gas analyzer. A sampling mechanism is connected to the housing by bearings. The sampling mechanism includes a sampling tube, a filter screen, a second gear, a movable frame, a second piston, a second spring, a circular plate and a convex block. The sampling tube is connected to the housing by bearings, and the right end of the sampling tube is in a horn-shaped structure. A filter screen is fixed inside the sampling tube. A second gear is fixed on the sampling tube. The second gear is connected to a transmission mechanism. A movable frame is slidably connected to the sampling tube. A second piston is fixed on the movable frame. The second piston is slidably connected to the sampling tube. A second spring is fixed between the movable frame and the sampling tube. The movable frame is slidably connected to the circular plate. The circular plate is fixed on the housing. Convex blocks are fixed on the circular plate at equal angles. The convex blocks are slidably connected to the movable frame.

[0008] Preferably, a key is installed on the gas analyzer, and a display screen is also installed on the gas analyzer for data display. By operating the gas analyzer through the key, gas analysis can be realized, and combined with the display screen for data display, it is convenient for medical staff to view.

[0009] Preferably, a fixing frame is fixed on the front side of the housing, and a motor is fixed on the fixing frame. The motor is connected to a sample delivery mechanism and is also connected to the transmission mechanism. Through the above structure, it can provide a basic guarantee for the normal operation of the device.

[0010] Preferably, the sample delivery mechanism includes a rotating plate, a sample storage bin, a first piston, a first spring, a sliding rod, a strong magnet, an iron column, a plastic block and a cross plate. The rotating plate is rotatably connected to the housing, and sample storage bins are opened on the rotating plate at equal angles. There are four sample storage bins, and the sample storage bins correspond to the convex blocks one by one. Through the function of the sample storage bins, it can not only store samples, but also avoid cross-contamination of air in different directions, ensuring the accuracy of detection data.

[0011] Preferably, a cross plate is fixed at the front end of the rotating plate, and the cross plate is fixed on the output shaft of the motor. Each time the cross plate rotates 90°. Through the function of the motor, it can provide a basic driving force for the rotation of the cross plate and the rotating plate. And by limiting the rotation angle of the cross plate, it can provide a basic guarantee for the operation of the device.

[0012] Preferably, a first piston is slidably connected in the sample storage bin, and one end of the first piston is fixedly connected to one end of a first spring, and the other end of the first spring is fixed on the rotating plate. Through the sliding action between the first piston and the sample storage bin, the discharge of the gas sample can be realized, which is convenient for the detection of the sample. With the elastic action of the first spring, a basic acting force can be provided for the automatic reset of the first piston.

[0013] Preferably, the slide rod is slidably connected to the rotating plate, and the other end of the slide rod is fixedly connected to the strong magnet. Through the sliding action between the slide rod and the rotating plate, the stability of the movement of the first piston can be ensured.

[0014] Preferably, a magnetic attraction structure is formed between the strong magnet and the iron column, and the iron column is fixed in the outer shell, and a plastic block is fixed on the iron column. At the same time, the iron column is connected to the output shaft of the motor by a bearing. Through the magnetic attraction between the strong magnet and the iron column, a basic acting force can be provided for the movement of the slide rod and the first piston. With the action of the plastic block, a basic guarantee can be provided for releasing the magnetic attraction between the strong magnet and the iron column.

[0015] Preferably, the transmission mechanism includes a driving gear, a transmission gear, a rotating shaft and a first gear. The driving gear is fixed on the output shaft of the motor, and the driving gear is arranged at the rear side of the outer shell, and the driving gear and the transmission gear are meshed and transmitted. At the same time, the transmission gear is fixed at the lower end of the rotating shaft, and the rotating shaft is connected to the circular plate by a bearing. Through the motor, a basic acting force can be provided for the rotation of the driving gear. With the transmission between the driving gear and the transmission gear, a basic acting force can be provided for the rotation of the rotating shaft and the first gear.

[0016] Preferably, the upper end of the rotating shaft is fixedly connected to the first gear, and the first gear and the second gear are meshed and transmitted. Through the transmission between the first gear and the second gear, a basic acting force can be provided for the rotation of the sampling tube, so as to provide a basic guarantee for realizing multi-directional air sampling and detection.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: By detecting the content of harmful substances (PM2.5, carbon dioxide, carbon monoxide, sulfur dioxide, nitrogen dioxide) in the gas sample through the gas sensor in the gas analyzer, the normal detection can be ensured.

[0018] 1. The sampling probe for gas analysis adopts an intermittent rotation mechanism, which can adjust the sampling tube in different orientations, thus realizing gas sampling in different orientations and achieving comprehensive detection. Furthermore, it can avoid the influence of air flow on the accuracy and comprehensiveness of detection data. Together with the linked elastic exhaust mechanism, when the sampling tube rotates, the gas inside the sampling tube can be discharged to avoid cross-contamination of gases in different directions and affect the accuracy of detection data. Specifically, through the action of the motor, transmission mechanism and second gear, the automatic commutation of the sampling tube can be realized, providing a basic guarantee for multi-directional gas detection. Together with the action of the movable frame, second piston, second spring, circular plate and convex block, during the commutation process of the sampling tube, the second piston can move inside the sampling tube, thereby exhausting the gas inside the sampling tube and avoiding cross-contamination of gases in different directions and affecting the accuracy of detection data;

[0019] 2. The sampling probe for gas analysis adopts a rotary storage and sample delivery mechanism, which can not only store and deliver gas samples, but also isolate gases in different orientations to ensure the normal progress of detection. Together with the linked exhaust structure, it can ensure that the gas sample smoothly enters the gas analyzer for detection, thus ensuring the normal progress of detection. Specifically, the motor drives the rotary plate and the cross plate to rotate intermittently, thereby driving the sample storage chamber to rotate. The gas sample can be stored through the sample storage chamber. When the sample storage chamber cooperates with the air outlet at the lower end of the outer shell, at this time, together with the action of the first spring, slide rod and first piston, the gas in the sample storage chamber can be sent into the gas analyzer. Brief Description of the Drawings

[0020] Figure 1 It is a front view three-dimensional structure schematic diagram of the whole device of the present invention;

[0021] Figure 2 It is a front view three-dimensional structure schematic diagram of the outer shell of the present invention;

[0022] Figure 3 It is a rear view three-dimensional structure schematic diagram of the outer shell of the present invention;

[0023] Figure 4 It is a side view sectional three-dimensional structure schematic diagram of the outer shell of the present invention;

[0024] Figure 5 It is a sectional three-dimensional structure schematic diagram of the rotary plate of the present invention;

[0025] Figure 6 It is a sectional three-dimensional structure schematic diagram of the sampling tube of the present invention.

[0026] In the figure: 1. Gas analyzer; 101. Button; 102. Display screen; 2. Outer shell; 3. Fixing bracket; 4. Motor; 5. Sample feeding mechanism; 501. Rotating plate; 502. Sample storage bin; 503. First piston; 504. First spring; 505. Slide bar; 506. Strong magnet; 507. Iron column; 508. Plastic block; 509. Cross plate; 6. Transmission mechanism; 601. Driving gear; 602. Driven gear; 603. Rotating shaft; 604. First gear; 7. Sampling mechanism; 701. Sampling tube; 702. Filter screen; 703. Second gear; 704. Movable frame; 705. Second piston; 706. Second spring; 707. Circular plate; 708. Protrusion. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1-6 , the present invention provides a technical solution: A sampling probe for gas analysis, including a gas analyzer 1 and an outer shell 2. The outer shell 2 is connected to the gas analyzer 1. A gas sensor is installed in the gas analyzer 1. The sampling mechanism 7 is connected to the outer shell 2 by a bearing. The sampling mechanism 7 includes a sampling tube 701, a filter screen 702, a second gear 703, a movable frame 704, a second piston 705, a second spring 706, a circular plate 707 and a protrusion 708. The sampling tube 701 is connected to the outer shell 2 by a bearing, and the right end of the sampling tube 701 is in a trumpet shape. The filter screen 702 is fixed in the sampling tube 701. The second gear 703 is fixed on the sampling tube 701. The second gear 703 is connected to the transmission mechanism 6. The movable frame 704 is slidably connected to the sampling tube 701. The second piston 705 is fixed on the movable frame 704. The second piston 705 is slidably connected to the sampling tube 701. The second spring 706 is fixed between the movable frame 704 and the sampling tube 701. The movable frame 704 is slidably connected to the circular plate 707. The circular plate 707 is fixed on the outer shell 2. The protrusions 708 are equally angularly fixed on the circular plate 707. The protrusions 708 are slidably connected to the movable frame 704.

[0029] A fixing frame 3 is fixed to the front side of the outer shell 2, and a motor 4 is fixed to the fixing frame 3. The motor 4 is connected to the sample feeding mechanism 5 and also connected to the transmission mechanism 6. The transmission mechanism 6 includes a driving gear 601, a transmission gear 602, a rotating shaft 603 and a first gear 604. The driving gear 601 is fixed to the output shaft of the motor 4 and is arranged at the rear side of the outer shell 2. The driving gear 601 meshes with the transmission gear 602. The transmission gear 602 is fixed to the lower end of the rotating shaft 603, and the rotating shaft 603 is connected by bearings to the circular plate 707. The upper end of the rotating shaft 603 is fixed to the first gear 604, and the first gear 604 meshes with the second gear 703.

[0030] When using the sampling probe for gas analysis, as Figures 1-6 shown, at this time, the outside gas enters the sample storage chamber 502 through the sampling pipe 701 and the outer shell 2 for storage. With the function of the filter net 702, the filtering of dust and foreign matters in the air can be realized, avoiding the influence of dust and foreign matters on the accuracy of subsequent detection data. When the gas enters the sample storage chamber 502, the first sampling function is achieved. After the sampling is completed, the motor 4 is controlled to drive the driving gear 601 to rotate 90°. With the transmission between the driving gear 601 and the transmission gear 602, the rotating shaft 603 and the first gear 604 rotate 90°. Then, with the transmission between the first gear 604 and the second gear 703, the sampling pipe 701 rotates 90° to achieve the sampling function of gases in different directions. During the rotation of the sampling pipe 701, the movable frame 704 is synchronously driven to rotate. When the movable frame 704 separates from the convex block 708, under the action of the second spring 706, the movable frame 704 moves towards the sampling pipe 701, so that the second piston 705 slides in the sampling pipe 701 towards the bell mouth direction of the sampling pipe 701. Through the action of the second piston 705, the gas in the sampling pipe 701 can be discharged to avoid the cross contamination of gases in different directions. When the gas in the sampling pipe 701 is discharged, through the air flow action, the dust and foreign matters adhered to the outer surface of the filter net 702 can be blown off to ensure the cleanliness of the surface of the filter net 702. When the movable frame 704 contacts and slides on the circular plate 707, the second piston 705 can block the air outlet at the lower end of the sampling pipe 701 to prevent air from entering the sampling pipe 701. When the sampling pipe 701 rotates 90°, the movable frame 704 contacts the end of the next convex block 708. According to the above principle, the second piston 705 is reset to release the blocking effect on the air outlet at the lower end of the sampling pipe 701, facilitating the gas in the next direction to enter the sampling pipe 701 for sampling operation.

[0031] The gas analyzer 1 is equipped with a button 101, and a display screen 102 is also installed on the gas analyzer 1 for data display; the sample feeding mechanism 5 includes a rotating plate 501, a sample storage bin 502, a first piston 503, a first spring 504, a sliding rod 505, a strong magnet 506, an iron column 507, a plastic block 508 and a cross plate 509. The rotating plate 501 is rotatably connected to the outer shell 2, and sample storage bins 502 are equiangularly arranged on the rotating plate 501, and there are four sample storage bins 502, and the sample storage bins 502 and the convex blocks 708 are in one-to-one correspondence; a cross plate 509 is fixed at the front end of the rotating plate 501, and the cross plate 509 is fixed on the output shaft of the motor 4, and the cross plate 509 rotates 90° each time; a first piston 503 is slidably connected in the sample storage bin 502, and one end of the first piston 503 is fixedly connected to one end of the first spring 504, and the other end of the first spring 504 is fixed on the rotating plate 501; the sliding rod 505 is slidably connected to the rotating plate 501, and the other end of the sliding rod 505 is fixedly connected to the strong magnet 506; the strong magnet 506 and the iron column 507 form a magnetic attraction structure, and the iron column 507 is fixed in the outer shell 2, and a plastic block 508 is fixed on the iron column 507, and the iron column 507 and the output shaft of the motor 4 are connected by a bearing;

[0032] When the motor 4 drives the driving gear 601 to rotate, the cross plate 509 and the rotating plate 501 are synchronously driven to rotate, as Figures 1-6As shown, at this time, the strong magnet 506 and the iron column 507 are in a magnetic attraction state. When the rotating plate 501 rotates, it synchronously drives the sample storage bin 502 for storing samples to rotate (the sample storage bin 502 and the rotating plate 501 are relatively sealed to avoid gas leakage), thereby realizing the transportation of the sample. When the sample storage bin 502 for storing samples rotates to cooperate with the air outlet on the lower side of the outer shell 2, at this time, the strong magnet 506 and the iron column 507 are separated, and the strong magnet 506 cooperates with the plastic block 508. Since there is no magnetic attraction between the strong magnet 506 and the plastic block 508, the strong magnet 506 is forced to move downward under the action of the first spring 504. With the sliding guiding effect between the sliding rod 505 and the rotating plate 501, the stability of the movement of the strong magnet 506 can be ensured. When the strong magnet 506 moves, it synchronously drives the first piston 503 to move downward. Through the sliding action between the first piston 503 and the sample storage bin 502, the gas sample in the sample storage bin 502 can be squeezed into the air inlet pipe on the gas analyzer 1, and the sample is detected by the gas sensor in the gas analyzer 1 (PM2.5, carbon dioxide, carbon monoxide, sulfur dioxide, nitrogen dioxide). The detected gas is discharged through the air outlet pipe on the gas analyzer 1. When the gas in the sample storage bin 502 is completely discharged, it continues to rotate under the action of the motor 4. When the sample storage bin 502 is separated from the air outlet on the lower side of the outer shell 2, at this time, the position of the strong magnet 506 just cooperates with the iron column 507. And because the sample storage bin 502 and the outer shell 2 are in a sealed state, under the action of air pressure and the first spring 504, at this time, the strong magnet 506 will not be adsorbed to the iron column 507 as Figure 5 shown. When the sample storage bin 502 rotates to cooperate with the air inlet on the upper side of the outer shell 2, at this time, the sealed state between the sample storage bin 502 and the outer shell 2 is released, so that the strong magnet 506 and the iron column 507 are adsorbed, thereby moving the first piston 503 for sample collection and storage to ensure the normal operation of the device. This is the working principle of the sampling probe for gas analysis.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sampling probe for gas analysis, comprising a gas analyzer (1) and a housing (2), the gas analyzer (1) being connected to the housing (2), and a gas sensor being installed in the gas analyzer (1), characterized in that: A sampling mechanism (7) is connected to the outer shell (2) by bearings. The sampling mechanism (7) includes a sampling tube (701), a filter screen (702), a second gear (703), a movable frame (704), a second piston (705), a second spring (706), a circular plate (707) and a convex block (708). The sampling tube (701) is connected to the outer shell (2) by bearings, and the right end of the sampling tube (701) is of a trumpet-shaped structure. A filter screen (702) is fixed inside the sampling tube (701). A second gear (703) is fixed on the sampling tube (701). The second gear (703) is connected to the transmission mechanism (6). A movable frame (704) is slidably connected to the sampling tube (701). A second piston (705) is fixed on the movable frame (704). The second piston (705) is slidably connected to the sampling tube (701). A second spring (706) is fixed between the movable frame (704) and the sampling tube (701). The movable frame (704) is slidably connected to the circular plate (707). The circular plate (707) is fixed on the outer shell (2). Convex blocks (708) are fixed on the circular plate (707) at equal angles. The convex blocks (708) are slidably connected to the movable frame (704).

2. The sampling probe for gas analysis according to claim 1, wherein: A key (101) is installed on the gas analyzer (1), and a display screen (102) is also installed on the gas analyzer (1) for data display.

3. The sampling probe for gas analysis according to claim 1, wherein: A fixed frame (3) is fixed on the front side of the outer shell (2). A motor (4) is fixed on the fixed frame (3). The motor (4) is connected to the sample feeding mechanism (5) and is also connected to the transmission mechanism (6).

4. The sampling probe for gas analysis according to claim 3, characterized in that: The sample feeding mechanism (5) includes a rotating plate (501), a sample storage bin (502), a first piston (503), a first spring (504), a sliding rod (505), a strong magnet (506), an iron column (507), a plastic block (508) and a cross plate (509). The rotating plate (501) is rotatably connected to the outer shell (2). Sample storage bins (502) are provided on the rotating plate (501) at equal angles. There are four sample storage bins (502), and the sample storage bins (502) correspond to the convex blocks (708) one by one.

5. The sampling probe for gas analysis according to claim 4, characterized in that: A cross plate (509) is fixed at the front end of the rotating plate (501). The cross plate (509) is fixed on the output shaft of the motor (4), and the cross plate (509) rotates 90° each time.

6. The sampling probe for gas analysis according to claim 4, characterized in that: A first piston (503) is slidably connected to the sample storage bin (502). One end of the first piston (503) is fixed to one end of the first spring (504), and the other end of the first spring (504) is fixed on the rotating plate (501).

7. The sampling probe for gas analysis according to claim 4, characterized in that: The sliding rod (505) is slidably connected to the rotating plate (501), and the other end of the sliding rod (505) is fixed to the strong magnet (506).

8. A sampling probe for gas analysis according to claim 4, characterized in that: A magnetic attraction structure is formed between the strong magnet (506) and the iron column (507). The iron column (507) is fixed inside the housing (2), a plastic block (508) is fixed on the iron column (507), and the iron column (507) is connected to the output shaft of the motor (4) by a bearing.

9. The sampling probe for gas analysis according to claim 3, wherein: The transmission mechanism (6) includes a driving gear (601), a transmission gear (602), a rotating shaft (603) and a first gear (604). The driving gear (601) is fixed on the output shaft of the motor (4), the driving gear (601) is arranged at the rear side of the housing (2), the driving gear (601) is in meshing transmission with the transmission gear (602), the transmission gear (602) is fixed at the lower end of the rotating shaft (603), and the rotating shaft (603) is connected to the circular plate (707) by a bearing.

10. A sampling probe for gas analysis according to claim 9, characterized in that: The upper end of the rotating shaft (603) is fixed to the first gear (604), and the first gear (604) is in meshing transmission with the second gear (703).

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